Butterfly-valve exhaust pipe



June 3, 1930. s, ARMITAGE 1,761,960

BUTTERFLY VALVE EXHAUST PIPE Filed Dec. 19, 1927 2 Sheets-Sheet 1 June 3, 1930.. v s. ARMITAGE 1,761,960

BUTTERFLY VALVE EXHAUST PIPE Filed Dec. 19, 1927 '2 Sheets-Sheet 2 Patented J ne's, vi930 UNITED STATES PATENT OFFICE snvnsrna' AnmrAen, or xIG'nLANn rAax, moment, Assrenon r GENERAL xo'rons conronA'rron, or nn'rnorr, MICHIGAN, A CORPORATION or DELAWARE Bowman's-VALVE nxnAUsr PIPE Application filed December 19, 1927. Serial No. 241,098.

. This invention relates to internal combustion engines as used on automotive vehicles and has particular reference to a means for diverting the flow of exhaust gases to cause a preheating of the fuel mixture.

During the starting period and in cold weather, internal combustion engines do not function any too well, and it is accordingly one of the principal objects of the invention an to equip the engine with a suitable heating arrangement whereby a larger amount of the hot exhaust gases may be caused to flow around the fuel intake in orderthat the inco'mingiuel mixture may be more readily heated and thus increase its firing condition. The invention is principally concerned with internal combustion engines of the V-type Y having two banks of cylinders arranged in V- form'." Each bank has an exhaust manifold an which are connected at theircenters by a transverse passage which will permit the how of the exhaust gases from one manifold to another. Within this transverse passage there is arranged the fuel intake leading to the intake manifold.

in one or both of the exhaust manifolds I arrange a valve, preferably of the butterfly pe which is capable of hand operation by t e driver at the dash. This valve is normalgn ly open to allow the free passage of the exhaust gases, but during the starting period or in cold weatherit may be closed to any desired degree to thereby force the exhaust gas' In internal combustion engines of the V- type two preferred methods of removing the exhaust are in use. The first'method uses individual exhaust pipes for each bank, while the second method joins the exhaust manifolds at one end and allows the exhaust gas to pass ofi' through a common exhaust pipe.

- In the second instance the butterfly valve may haust opening of each cylinder to prevent the valve to the other manifold, through the in-- carburetor may be interconnected with the 'lever which operates the. butterfly valve in the exhaust. This connection will permit, of the simultaneous operation of the throttle valve and exhaust valve by the use of a single lever. In practice, I prefer to use the accel- ,erator'pedal as the coon means for opera ating the throttle and valve. I

The exhaust manifold will preferably be so shaped that a lip or finextends over the exexhaust gas from the adjoining cylinder tending to turn thereinto. As the exhaust gas passes the lip, its momentum will have a tendenoy to pull the exhaust gas from the exhaust port and thereby increase the efliciencyof the engine;

Where the exhaust manifolds are joined at their ends by a common connection, an additional lip is preferably positioned within the connection at the point where the exhaust 1gases from the two manifolds meet. The exaus't gas from the one cylinder bank will thereby'surge past the lip and tend to draw the exhaust gases from the other cylinder the action being in the nature of a syphon edecti The invention is disclosed on the accompanying drawing in which Figure 1 is a plan view of the V-type internal combustion engine having a single exhaust pipe and showing my invention applied theretol I Figure2 is a horizotal sectional plan view through the manifolds of Figure 1.

Figure 3 is a plan view similar to Fi showlng the invention applied to a engine having individual exhaust eachbank of cylinders.

Figure 4 is a detailed; view of the accelerator edal and connections shown in Figure 3.

I 90 pipes 'for igure 5 is a sectional view on the line 5-J-5 x .tive vehicle as is necessary to illustrate-the invention. 12 is an internal combustion engine of the V-type having the two banks 14 and 16, each bank having an exhaust manifold as shown at 18 and 20. These two ex-; haust manifolds '18 and 20 are united at their front end by means of a connection 22 which delivers the exhaust gases into a common exhaust pipe 24. The manifold 20 terminates at 26 an 7 28in which there is mounted a valve 30 which may beof any suitable kind, but is preferably of the butterfly ty e. This valve is p1votally mounted Within t c section 28 by means of a stem 32 having secured thereto at one end an arm 34 connected by means of a link 36 v to an o erating lever 38 located at the dash 40 of t e vehicle 10. Instead of using the section 28, the butterfly valve may be positioned in an arm of the connection 28 or be mounted in the manifold proper, which vwill then extend to the connection 22 and include the length taken up by the section 28 The two manifolds 18 and 20 are united b means of a transverse passage 42, preferably positioned between the centers of the two manifold This passage 42 surrounds the intake 44 leading from the carburetor 46 andconducting the gases into the intake manifolds 48. The gases as they .pass

' throu h the transverse passages 42 and aroun the intake 44 serve to heat the incoming carburetedmixture prior to its entry into the firing chambers. Normally, or when the valve'30 is open, only a relatively small amount of exhaust gas pulsates throu h the passage 42, but with the valve in close position, all of the exhaust gas from one bank is forced through the passage, causing a relatively very much greater preheating of the fuel mixture.

During the startin period or in cold weather when it is desire to have adidtional heat transmitted to the carbureted fuel, the lever 38 may be operated to swing the valve 30 to thereby more or less close t e exhaust opening at, the section-28. This will cause the exhaust gases from the manifold 20 to pass throu lathe-- assage 42 and into the exhaust mani Id 18 cm where they will be delivered f to the connection 22 and into the exhaust pipe 24. I As the valve 30 is subject to manual control, the heat necessary for the incoming mixture may be controlled at the will of'the driver. :If desired, the valve 30 may be interconnected with the throttle valve so that both may be simultaneously operated.

Referring to Figure 2, each exhaust port ,50 is provided with an overhanging lip or fin 52, the purpose of which is to prevent the tendency of the exhaust gas from one cylinder to enter the exhaust passage of the next adjoinin cylinder. The'fin 52 has thefunc-. tion 0 causing the gas from one cylinder to pass the exhaust port of the adjoining exhas applied thereto a short section haust with a surge and its momentum will tend to pull theexhaust gases out of the exhaust port of thel'atter, thereby increasing theefiiciency of the en 'ne.

The connection 22 itwill be noted has a 54 positioned at the point of 'unction in the connection of the arm 23 lea rig to the manifold 20. The function of the fin or lip 54 is similar to the function of the lips 52; that is, as the exhaust gas from the manifold 18 surges past the lip 54,'its momentum will tend to draw the exhaust gas from the manifold 20, thereby increasing the efiiciency of the engine. I The structure of-Figure 3 differs from that of Figure '1 in that the V-type engine has separate exhaust pipes 56 and 58 leading from the exhaust manifolds 18' and 20'; The transverse passage 42 and the carburetor 46 together with the intake 44 are in all respects similar to the corresponding parts shown on Figures 1 and 2.

Figure 3 is preferably journaled in a section 60 which forms apart of the manifold 20'. This section 60 forms a connection between the manifold 20' and the exhaust pipe 58- and these parts are secured together by means of the flanges 62 and bolts64. While I haveshown the valve as positioned in a separate section, this section may be omitted and the valve placed either in the manifold proper or in the exhaust pipe.

The butterfly valve 30' in the species of The valve 30' has the stem 66 and secured to the stem is' the lever or arm 68 which in turn is secured to a rod 70 fastened at 72 to an arm 7 4 which is secured to the accelerator 'pedal 7 6 pivoted at 78 to a bracket 7 9 secured to the foot board 80. I

The attachment of the link 70 to the arm 68 is made by .means of two springs 88 positioned at either side of the arm 68 and held in place by means of the nuts 90 fastened to the rod 70. This forms a resilient connection.

76 it will be seen' that the valve 30 and the" throttle valve are ca able of simultaneous operation. It is pre erred that the arrangement be such that when the accelerator pedal is in closed'throttle position the butterfly valve will close the exhaust manifold,20',

thereby causing-all theexhaust gases from this side of the engine to flow into the transverse passage 42, around the heating jacket of the intake manifold, into the second manifold and thence out at the exhaust pipe. As the throttle is opened the butterfly valve 30' also opens so that at high, speeds the butterfly valve will oifer substantially no resistance to the exhaust gases.

If desired, a butterfly valve may be placed in both exhaust pipes and obviously but one of them operated at a time. I claim:

1. In combination with an internal comibustion engine, a plurality of exhaust manifolds, means interconnecting with said manifolds, and means in one manifold to divert the exhaust gases into a second manifold.

2. In combination wit-h an internal combustion engine having a plurality of banks of cylinders, an exhaust manifold for each bank,

means interconnecting with said manifold, a valve in one, manifold for diverting the exhaust gas through a second manifold.

3. In combination with an internal combustion engine having a plurality of exhaust manifolds, a passage interconnecting said; manifolds, and a valve in one of said manifolds for diverting the exhaust gas through the passage and into a second manifold.

4. In combination with an internal combustion engine having a plurality of manifolds, a passage connecting said manifolds at their centers, and a valve in one of said mani folds for diverting the exhaust gas through the passage and into a second manifold.

5. In combination with an internal combustion engine having a plurality of interconnected exhaust manifolds, and a butterfly valve in one of said manifolds for forcing-the gas therefrom through the connection and into a second manifold.

6. In combination with an automotive vehicle, an engine having a plurality of'exhaust manifolds, a passage interconnecting said manifolds, means in one manifold to divert the gases to a second manifold, and means operable from the inside of the vehicle for controlling the position of the first named means.

7. In combination with an internal combustion engine having a plurality of exhaust manifolds, a plurality of connections between said manifolds, and means in one of said manifolds to divert the gases through one of said connections and into a second manifold and thence into a second connection.

8. In combination with an internal combustion engine, a plurality of exhaust manifolds,

means interconnecting said manifolds, and a' valve in one manifold to divert the exhaust gases into a second manifold.

9. In combination with an internal combustion engine, a plurality of exhaust manifolds, means interconnectin said manifolds, and a valve in one manifol operated from a remote point to divert the exhaust gases'into a second manifold.

10. In combination with an automotive vehaving two banks .of cylinders, an exhaust manifold at each bank of cylinders, a connection between the two manifolds, a valve in one manifold adapted to close said manifold and divert the exhaust gas to the other manifold, and means intercor iecting said manifolds at their ends to a common exhaust pipe.

12. In combination with a V-type engine having two banks of cylinders, an exhaust manifold at each bank of cylinders, a connection between the two manifolds, a valve in one manifold adapted to close said manifold and divert the exhaust gas to the other manifold, means for delivering carburetted fuel to the engine, means in said connection to preheat said carburetted fuel, and means in; terconnecting said manifolds at their ends to a'common exhaust pipe.

13. In combination with an engine having a plurality of exhaust manifolds, means interconnecting said manifolds intermediate their ends, means interconnecting said manifolds at their ends, a section interposed between one manifold and the end connection,

and means in said connection adapted to divert all the exhaust gas through said intermediate connection to one manifold.

14. In combination with an engine having a plurality of exhaust manifolds, means interconnecting said manifolds intermediate their 'ends, means interconnecting said manifolds at their ends, a section interposed between one manifold and the end connection, and a valve in said connection adapted to divert all the exhaust gas through said intermediate connection to one manifold.

In testimony whereof I affix my signature.

Y SYLVESTER ARMITAGE. 

